Well some time ago the game let me set the resolutions I wanted the 128x and 256x ... Now it is restricting me to put them the following message appears ... "This resolution is incompatible with your device becuase your device doens't have enough memory "... But my device has 6 GB of RAM and I've used much heavier textures than this ... This restriction is a shame. Let users choose what they want.
How can I buy textures if the game doesn't let me use them all.
The image below shows this.
This is most likely an issue the texture pack creators will need to fix.
You can contact them about this issue here.